Player Damage to enemy damage melee system

Good day! I have finally learned how to do melee system by watching a video here:https://www.youtube.com/watch?v=TWQlNztOoSM I have learned alot from this video, and I recommend you watch it too. My next step is how do I convert this to the enemy this time? Do I completely use a different method like, on trigger or on collision? Thanks for the future replies,cheers!